The Keyboard Focus Highlight

Presence

It is shown when `hlthickness, whose default value is 1, is not 0.

Contents

The highlight is a border `hlthickness thick around the body.

Color

When the object has keyboard focus, the color of the highlight is `hl, whose default is `yellow (more precisely, the value of s.YELLOW), and at other times the color of the highlight is `bg, whose default is `black (more precisely, the value of s.BLACK).  The object may have focus because the mouse pointer was moved into it, its `focus attribute was set, or the focus was moved using the Tab key, for instance.


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